L1.2.1.1.1: Cerebral Hemispheres

• CEREBRAL HEMISPHERES

  ● Paired (left and right) superior parts of the brain; collectively called the cerebrum

  ● Include more than half of the brain mass

  ● Longitudinal cerebral fissure — deep fissure which incompletely separates the 2 cerebral hemispheres from one another
• SURFACE OF CEREBRAL HEMISPHERE

  ○ Gyri

  ○ Sulci

  ○ Fissures
• ○ Gyri

  ■ Elevated ridges of tissue

  ■ Singular term = “gyrus”

  ■ Means “twisters”
• ○ Sulci

  ■ Shallow grooves that separate gyri

  ■ Singular term = “sulcus”

  ■ Means “furrows”

  ■ 3 most prominent sulci: lateral sulcus (sylvian), central sulcus, parietal-occipital sulcus
• ○ Fissures

  ■ Deeper grooves/sulcus

  ■ Less numerous than sulci

  ■ Dictates the boundary of the lobes
• 4 LOBES

  *named after the cranial bones that lie over them*

  • Frontal Lobe
  • Parietal Lobe
  • Temporal Lobe
  • Occipital Lobe
• Frontal Lobe

  Motor function, motivation, aggression
• Parietal Lobe

  Reception and evaluation of sensory information
• Temporal lobe

  Smell, hearing, memory, and abstract thought
• Occipital Lobe

  Visual processing